Balance Sheets (Parenthetical) - $ / shares shares in Thousands |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Preferred stock, authorized | 2,500 | 2,500 |
| Preferred stock, issued | 0 | 0 |
| Preferred stock, outstanding | 0 | 0 |
| Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Common stock, authorized | 47,500 | 47,500 |
| Common stock, issued | 17,117 | 15,034 |
| Common stock, oustanding | 17,117 | 15,034 |